Radar north finder inspection and calibration device

Abstract

The utility model discloses an inspection and calibration device for a radar north seeker, which relates to the field of online inspection and calibration of the radar north seeker and comprises a precise structural body and an auxiliary device, the precise structural body can be fixed on the radar north seeker, and the auxiliary device can be arranged on one side of the radar north seeker; the precise structure body comprises a main antenna, a satellite receiver, a distance measuring probe, a distance measuring host and a data processing circuit; the number of the distance measuring probes is two, and the two distance measuring probes are horizontally arranged at intervals. The number of the distance measuring hosts is two, and the two distance measuring probes are connected with the two distance measuring hosts respectively. The main antenna is connected with the satellite receiver. The satellite receiver and the ranging host are connected with the data processing circuit. The auxiliary device comprises an auxiliary antenna which is connected with the satellite receiver. The utility model has the advantage that the on-line inspection and calibration of the radar north seeker are realized.

Description

Technical Field

[0001] The utility model relates to the field of online inspection and calibration of radar north finders, in particular to a radar north finder inspection and calibration device. Background Art

[0002] Radar heading primarily relies on a north-finder combined with radar measurement indications. By measuring the Earth's rotational angular velocity, north-finders can autonomously determine the true north direction of the attached carrier, unaffected by external magnetic fields or other environmental influences. They are widely used in radar applications. Before installation, the north-finder is calibrated using a high-precision astronomical reference station to determine true north. After installation on the radar, a high-precision total station is used to eliminate installation errors. As radars migrate over time and are subject to various complex operating environments, a loss of north-finding accuracy can be difficult to detect in the field.

[0003] The reduced accuracy of the north-finder provided inaccurate true north information, leading to errors in target bearings. Radars individually captured targets and reported them to higher-level communications headquarters. After intelligence fusion, a single batch of targets could become multiple batches, severely impacting and restricting radar effectiveness.

[0004] Existing methods are unable to perform online inspection and calibration of radar north finders. After long-term use, the main rotating mechanism and optoelectronic devices of the north finder will suffer from component wear and decreased device accuracy, resulting in a decrease in north-seeking accuracy. However, at this time, only the accuracy has decreased, and the north finder does not report an error to the system. The radar system will mistakenly believe that the north finder's measurement results are still accurate and reliable, resulting in the radar's incorrect identification of the target source. Utility Model Content

[0005] The technical problem to be solved by the utility model is to realize the online inspection and calibration of a radar north finder.

[0006] The present utility model solves the above-mentioned technical problems through the following technical means: a radar north-finder inspection and calibration device, comprising a precision structure and an auxiliary device, wherein the precision structure can be fixed on the radar north-finder, and the auxiliary device can be arranged on one side of the radar north-finder; the precision structure comprises a main antenna, a satellite receiver, a ranging probe, a ranging host, and a data processing circuit; the ranging probes are provided in two, and the two ranging probes are arranged horizontally at intervals; the ranging hosts are provided in two, and the two ranging probes are connected to the two ranging hosts respectively; the main antenna is connected to the satellite receiver, and the satellite receiver and the ranging host are both connected to the data processing circuit; the auxiliary device comprises an auxiliary antenna, and the auxiliary antenna is connected to the satellite receiver. The reference plane heading of the radar north-finder is transferred to the radar north-finder inspection and calibration device, and the true heading value can be obtained through test and solution, thereby realizing online inspection and calibration of the radar north-finder.

[0007] As an optimized technical solution, the precision structure further includes a laser pointer connected to the data processing circuit and serves as an antenna alignment device.

[0008] As an optimized technical solution, the auxiliary device also includes an auxiliary bracket and a four-dimensional gimbal. The four-dimensional gimbal is mounted on the auxiliary bracket, and the auxiliary antenna is mounted on the rotating end of the four-dimensional gimbal. The auxiliary bracket is a tripod for support, and the four-dimensional gimbal is used to fine-tune the position of the auxiliary antenna to facilitate laser pointer alignment.

[0009] As an optimized technical solution, the precision structure also includes two translation stages, which are horizontally spaced and adjustable in spacing. The two ranging probes are mounted on each of the two stages. The spacing between the two ranging probes can be adjusted to accommodate radar north finders of varying sizes.

[0010] As an optimized technical solution, the precision structure also includes a positioning mounting plate, a threaded locking member and a locking plate. Positioning mounting plates are respectively provided on the precision structure at positions corresponding to both sides of the radar north finder. The threaded locking member is threadedly connected to one of the positioning mounting plates, and one end of the threaded locking member is located between the two positioning mounting plates and is fixedly connected to a locking plate.

[0011] As an optimized technical solution, the precision structure further includes a lithium battery connected to the data processing circuit, and the lithium battery serves as power supply for the entire device.

[0012] As an optimized technical solution, the precision structure also includes a main bracket and a chassis. The chassis is fixedly connected to the main bracket. The main antenna, satellite receiver and ranging probe are all installed on the main bracket. The ranging host, lithium battery and data processing circuit are all installed inside the chassis.

[0013] As an optimized technical solution, the housing of the chassis is equipped with a power switch and a power status indicator light, and both the power switch and the power status indicator light are connected to the data processing circuit, so as to facilitate observation of the power-on status.

[0014] As an optimized technical solution, a measurement status indicator light is installed on the housing of the chassis, and the measurement status indicator light is connected to the data processing circuit to facilitate observation of the measurement status.

[0015] As an optimized technical solution, the housing of the chassis is equipped with a power digital display screen, which is connected to the data processing circuit to facilitate observation of power.

[0016] The advantages of the present invention are:

[0017] 1. The reference plane heading of the radar north finder is transferred to the radar north finder inspection and calibration device. The true heading value can be obtained through test calculation, thereby realizing online inspection and calibration of the radar north finder.

[0018] 2. The distance between the two ranging probes can be adjusted through the translation stage to accommodate radar north finders of different sizes.

[0019] 3. Convenient to observe the power-on status, measurement status and power level. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a schematic structural diagram of a radar north finder inspection and calibration device according to an embodiment of the present invention.

[0021] Figure 2 It is a structural diagram of the precision structure chassis of an embodiment of the utility model.

[0022] Figure 3 It is a schematic diagram of the structure inside the chassis of an embodiment of the present utility model.

[0023] Figure 4 It is a structural schematic diagram of the main bracket of an embodiment of the utility model.

[0024] Figure 5 It is a schematic diagram of the position of the distance measuring probe of the utility model relative to the reference plane.

[0025] Figure 6 This is a schematic diagram of the principle of calculating the angle between a precision structure and a reference plane according to an embodiment of the present utility model.

[0026] Figure 7 It is a principle diagram of dual-antenna direction finding according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] like Figures 1 to 5 As shown, an embodiment of the present utility model discloses a radar north finder inspection and calibration device, including a precision structure 1 and an auxiliary device (not shown in the figure). The precision structure 1 can be fixed on the radar north finder 2, and the auxiliary device can be arranged on one side of the radar north finder 2.

[0029] The precision structure 1 includes a main bracket 101, a chassis 102, a main antenna 103, a laser pointer 104, a satellite receiver 105, a displacement stage 106, a ranging probe 107, a positioning mounting plate 108, a threaded locking member 109, a locking plate 110, a ranging host 111, a lithium battery 112, a data processing circuit 113, a power switch 114, a power status indicator light 115, a measurement status indicator light 116 and a power digital display screen 117.

[0030] A main antenna 103 and a laser pointer 104 are installed on the top of the main bracket 101. The main antenna 103 receives satellite positioning signals for heading calculation, and the laser pointer 104 serves as an antenna alignment device. A satellite receiver 105 is installed at the bottom of the main bracket 101. The main antenna 103 is connected to the satellite receiver 105. The satellite receiver 105 is used to process the satellite signals received by the satellite antenna to obtain position and heading data. Two displacement platforms 106 are provided. The two displacement platforms 106 are horizontally spaced apart and arranged at positions corresponding to the reference plane 21 of the radar north finder 2 on the main bracket 101 and can adjust the spacing. Two ranging probes 107 are provided, and the two ranging probes 107 are respectively installed on the two displacement platforms 106. The displacement platform 106 adopts a dovetail groove manual displacement platform. The spacing between the two ranging probes 107 can be adjusted through the displacement platform 106 to adapt to radar north finders of different sizes. Instrument 2; the ranging probe 107 adopts an optical fiber ranging sensor, and the ranging probe 107 can detect the distance between the precision structure 1 and the reference plane 21, which is used to calculate the angle between the precision structure 1 and the reference plane 21; positioning mounting plates 108 are respectively provided at positions corresponding to the two sides of the radar north finder 2 on the main bracket 101, and the threaded locking members 109 adopt butterfly bolts. The threaded locking members 109 are threadedly connected to one of the positioning mounting plates 108, and the threaded locking members 109 are located between the two positioning mounting plates 108. One end of the threaded locking member 109 is fixedly connected with a locking plate 110; during installation, the locking plate 110 and the positioning mounting plate 108 opposite thereto are respectively located on the outside of both sides of the radar north finder 2, and then the threaded locking member 109 is rotated to make the locking plate 110 close to the side of the radar north finder 2, thereby fixing the precision structure 1 on the radar north finder 2, making it convenient for the two ranging probes 107 to align with the reference plane 21.

[0031] The chassis 102 is fixedly connected to the top of the main bracket 101, and the ranging host 111, the lithium battery 112 and the data processing circuit 113 are all installed inside the chassis 102; the ranging host 111 is a fiber optic ranging host, and there are two ranging hosts 111. The two ranging probes 107 are connected to the two ranging hosts 111 respectively, and the laser pointer 104, the satellite receiver 105, the ranging host 111 and the lithium battery 112 are all connected to the data processing circuit 113; the ranging host 111 calculates the time difference between the ranging probe 107 and the reference surface by calculating the time difference of the return light wave received by the ranging probe 107. 21's distance; the lithium battery 112 powers the entire device; the data processing circuit 113 is used to fuse the ranging data and the positioning and orientation data to calculate the true north value of the radar north finder 2; the outer shell of the chassis 102 is equipped with a power switch 114, a power status indicator 115, a measurement status indicator 116 and a power digital display screen 117. When the power switch 114 is turned on, the power status indicator 115 is always on. When the alignment is completed and the data collection test begins, the measurement status indicator 116 is always on. The power digital display screen 117 is used to display the power of the lithium battery 112.

[0032] The auxiliary device includes an auxiliary bracket, a four-dimensional gimbal and an auxiliary antenna. The four-dimensional gimbal is installed on the top of the auxiliary bracket, and the auxiliary antenna is installed at the rotating end of the four-dimensional gimbal. The auxiliary bracket adopts a tripod to play a supporting role. The four-dimensional gimbal is used to fine-tune the position of the auxiliary antenna to facilitate the alignment of the laser pointer 104. The auxiliary antenna receives satellite positioning signals for heading calculation. The auxiliary antenna is connected to the satellite receiver 105, and the auxiliary antenna cooperates with the main antenna 103 to form a dual-antenna direction-finding function.

[0033] The method for performing online calibration inspection of a radar north finder by the radar north finder inspection and calibration device comprises the following steps:

[0034] Step 1: fix the precision structure 1 on the radar north finder 2, arrange the auxiliary device on one side of the radar north finder 2, adjust the position of the auxiliary antenna, and align it using the laser pointer 104.

[0035] Step 2: Use two distance measuring probes 107 to detect the distance between the precision structure 1 and the reference surface 21, and then calculate the angle between the precision structure 1 and the reference surface 21. The principle is as follows:

[0036] like Figure 6 As shown, assuming that the distances between the precision structure 1 and the reference plane 21 measured by the two ranging probes 107 are d1 and d2 respectively, and the distance between the two ranging probes 107 is d, then the angle between the precision structure 1 and the reference plane 21 is

[0037] Step 3: Calculate the true north value of the radar north finder 2 through dual-antenna positioning.

[0038] The dual-antenna direction finding principle is as follows:

[0039] Based on the positioning of the satellite antenna, a coordinate system for the satellite signal receiving antenna is constructed, and the angle difference between the coordinate system and the earth coordinate system is calculated. Finally, the angle between the baseline and the true north direction is calculated based on the coordinates and trigonometric relationships.

[0040] like Figure 7 As shown in the figure, the coordinate system is a coordinate system constructed by the satellite navigation receiving antenna, with the main antenna 103 and one of the auxiliary antennas as the origin. The baseline component is located on the XOY plane, and the heading angle α is the angle between the baseline component and the true north direction, which is positive clockwise. The pitch angle θ is the angle between the line from the origin to the other antenna vertex and the XOY plane. According to the right-hand rule, it is positive upward. According to the trigonometric function relationship, the relationship between the heading angle α, the pitch angle θ and the coordinates (Δx, Δy, Δz) is obtained. The coordinates can finally be used to calculate the various angle values, as shown in equations (1) and (2):

[0041]

[0042] The utility model introduces a high-precision parameter measurement technology for the reference plane, transfers the reference plane heading of the radar north finder 2 to the radar north finder inspection and calibration device, and can obtain the true value of the heading through test and calculation, thereby realizing online inspection and calibration of the radar north finder 2. The radar north finder inspection and calibration device adopts a small-size design in structure, and has the characteristics of small size, light weight, low power consumption, flexible interface, etc., and is suitable for system integration applications.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A radar north finder inspection and calibration device, characterized by: The invention comprises a precision structure and an auxiliary device, wherein the precision structure can be fixed on a radar north finder, and the auxiliary device can be arranged on one side of the radar north finder; the precision structure comprises a main antenna, a satellite receiver, a ranging probe, a ranging host and a data processing circuit; two ranging probes are provided, and the two ranging probes are arranged horizontally and spaced apart; two ranging hosts are provided, and the two ranging probes are connected to the two ranging hosts respectively; the main antenna is connected to the satellite receiver, and the satellite receiver and the ranging host are both connected to the data processing circuit; the auxiliary device comprises an auxiliary antenna, and the auxiliary antenna is connected to the satellite receiver.

2. The radar north finder inspection and calibration device according to claim 1, characterized in that: The precision structure further includes a laser pointer, which is connected to the data processing circuit.

3. The radar north finder inspection and calibration device according to claim 2, characterized in that: The auxiliary device also includes an auxiliary bracket and a four-dimensional pan-tilt platform. The four-dimensional pan-tilt platform is installed on the auxiliary bracket, and the auxiliary antenna is installed at the rotating end of the four-dimensional pan-tilt platform.

4. The radar north finder inspection and calibration device according to claim 1, wherein: The precision structure further includes a translation platform. Two translation platforms are provided. The two translation platforms are arranged horizontally at intervals and the intervals between them can be adjusted. The two ranging probes are respectively mounted on the two translation platforms.

5. The radar north finder inspection and calibration device according to claim 1, characterized in that: The precision structure also includes a positioning mounting plate, a threaded locking piece and a locking plate. Positioning mounting plates are respectively provided at positions corresponding to both sides of the radar north finder on the precision structure. The threaded locking piece is threadedly connected to one of the positioning mounting plates, and one end of the threaded locking piece located between the two positioning mounting plates is fixedly connected to the locking plate.

6. The radar north finder inspection and calibration device according to claim 1, characterized in that: The precision structure further includes a lithium battery, which is connected to the data processing circuit.

7. The radar north finder inspection and calibration device according to claim 6, characterized in that: The precision structure also includes a main bracket and a chassis. The chassis is fixedly connected to the main bracket. The main antenna, satellite receiver and ranging probe are all installed on the main bracket. The ranging host, lithium battery and data processing circuit are all installed inside the chassis.

8. The radar north finder inspection and calibration device according to claim 7, characterized in that: The housing of the chassis is provided with a power switch and a power status indicator light, and both the power switch and the power status indicator light are connected to the data processing circuit.

9. The radar north finder inspection and calibration device according to claim 7, characterized in that The housing of the chassis is provided with a measurement status indicator light, which is connected to the data processing circuit.

10. The radar north finder inspection and calibration device according to claim 7, characterized in that: The outer shell of the chassis is equipped with a power digital display screen, and the power digital display screen is connected to the data processing circuit.

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